<template>
  <div class="login-container">
    <div class="logo" />
    <div class="form">
      <h1>登录</h1>

      <el-card shadow="never" class="login-card">
        <!--登录表单-->
        <el-form ref="loginRef" :model="loginForm" :rules="loginRules">
          <template v-if="currentLogin === 'phone'">
            <el-form-item prop="mobile">
              <el-input v-model="loginForm.mobile" placeholder="请输入账号" />
            </el-form-item>
            <el-form-item prop="password">
              <el-input v-model="loginForm.password" show-password placeholder="请输入密码" type="password" />
            </el-form-item>
            <el-form-item prop="isAgree">
              <el-checkbox v-model="loginForm.isAgree">请阅读用户协议</el-checkbox>
            </el-form-item>
            <el-form-item>
              <el-button style="width:350px" type="primary" @click="login">登录</el-button>
            </el-form-item>
          </template>
          <div v-else class="qrcode-login">
            <!-- 二维码 需要使用canvas的dom对象 -->
            <div v-if="codeState === 2" class="qrcode-layer scan_success">
              <span>用户已扫码</span>
              <i class="el-icon-check" />
            </div>
            <div v-else-if="codeState === 4" class="qrcode-layer timeout" @click="createQrCode">
              <span>二维码失效</span>
              <i class="el-icon-refresh-right" />
            </div>
            <div v-else-if="codeState === 5" class="qrcode-layer timeout" @click="createQrCode">
              <span>用户已取消</span>
              <i class="el-icon-refresh-right" />
            </div>
            <canvas ref="qrcodeCanvas" />
          </div>
          <el-form-item>
            <el-row style="width:350px" type="flex" justify="space-between">
              <el-button size="small" style="width:48%" @click="changeLogin('phone')">手机号登录</el-button>
              <el-button size="small" style="width:48%" @click="changeLogin('qrcode')">扫码登录</el-button>
            </el-row>
          </el-form-item>
        </el-form>
      </el-card>

    </div>
  </div>
</template>

<script>
import { getQrcodeKeyAPI, getQrCodeStateAPI } from '@/api/user'
import QrCode from 'qrcode'
export default {
  name: 'Login',
  data() {
    return {
      codeState: 1,
      qrCodeKey: '', // 声明一个加密串的变量
      currentLogin: 'phone',
      loginForm: {
        mobile: process.env.NODE_ENV === 'development' ? '13800000002' : '',
        password: process.env.NODE_ENV === 'development' ? 'hm#qd@23!' : '',
        isAgree: process.env.NODE_ENV === 'development'
      },
      loginRules: {
        mobile: [
          { required: true, message: '请输入手机号', trigger: 'blur' },
          { pattern: /^1[3-9]\d{9}$/, message: '手机号格式不正确', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 16, message: '密码长度应该为6-16位之间', trigger: 'blur' }
        ],
        isAgree: [
          {
            validator: (rule, value, callback) => {
            // rule规则
            // value检查的数据 true/false
            // callback 函数 执行这个函数
            // 成功执行callback 失败也执行callback(错误对象 new Error(错误信息))
              value ? callback() : callback('没有勾选用户平台协议')
            }
          }
        ]
      }
    }
  },
  watch: {
    currentLogin() {
      if (this.currentLogin === 'qrcode') {
        // 只要切换过来就生成
        this.createQrCode()
      } else {
        clearInterval(this.timer)
      }
    }
  },
  beforeDestroy() {
    clearInterval(this.timer)
  },
  methods: {
    beginCheckLoop() {
      // 检查逻辑
      const checkState = async() => {
        try {
          const { codeState, token } = await getQrCodeStateAPI({ qrcode_key: this.qrCodeKey })
          this.codeState = codeState
          if (this.codeState === 4 || this.codeState === 5) {
            clearInterval(this.timer)
          } else if (this.codeState === 3) {
            clearInterval(this.timer)
            this.$store.commit('user/SET_TOKEN', token)
            this.$router.push('/')
          }
        } catch (error) {
          // 处理错误
          clearInterval(this.timer)
        }
      }
      // 记录当前的标记
      this.timer = setInterval(() => {
        // 检查逻辑
        checkState()
      }, 1000)
    },
    async createQrCode() {
      this.codeState = 1 // 此时重新开始
      await this.getQrCodeKey() // 生成二维码- 此时一定有加密串 => 生成二维码
      this.beginCheckLoop()
      QrCode.toCanvas(this.$refs.qrcodeCanvas, this.qrCodeKey, {
        width: 300,
        height: 300
      })
    },
    // 获取加密串的方法
    async getQrCodeKey() {
      this.qrCodeKey = await getQrcodeKeyAPI()
    },
    changeLogin(mode) {
      this.currentLogin = mode
    },
    login() {
      // 切换登录方式
      this.$refs.loginRef.validate((e) => {
        if (e) {
          const { mobile, password } = this.loginForm
          this.$store.dispatch('user/login', { mobile, password })
        }
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.qrcode-login {
    width: 350px;
    padding: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
  }
.qrcode-layer {
    position: absolute;
    width: 150px;
    height: 150px;
    left: 50%;
    top: 50%;
    transform: translate(-75px, -75px);
    opacity: 0.9;
    background: #e1dede;
    display: flex;
    justify-content: center;
    align-items: center;
    i {
      font-size: 40px;
      padding: 10px;
    }
  }
  .scan_success {
    i {
      color: #67C23A;
    }
  }
  .timeout {
    i {
      color: #F56C6C;
    }
  }
.login-container {
    display: flex;
    align-items: stretch;
    height: 100vh;
    .logo {
      flex: 3;
      background: rgba(38, 72, 176) url(../../assets/common/login_back.png)
        no-repeat center / cover;
      border-top-right-radius: 60px;
    }
    .form {
      flex: 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding-left: 176px;
      .el-card {
        border: none;
        padding: 0;
      }
      h1 {
        padding-left: 20px;
        font-size: 24px;
      }
      ::v-deep .el-input {
        width: 350px;
        height: 44px;
        .el-input__inner {
          background: #f4f5fb;
        }
      }
      ::v-deep .el-checkbox {
        color:#606266;
      }
    }
    }
</style>
